Wire collection device with increasing collection diameter

Abstract

A stent deployment system includes a wire collection device with a profiled retraction wire and an actuator coupled to a collection spindle. A distal end of the profiled retraction wire is coupled to a sledge that is coupled to an outer sheath. A proximal end of the profiled retraction wire is coupled to the collection spindle. The actuator can actuate rotation of the collection spindle to collect the profiled retraction wire around the collection spindle, and collection of the profiled retraction wire retracts the outer sheath across an outer surface of the stent so as to deploy a stent surrounded by a distal end of the outer sheath. The wire collection device has a varying collection diameter that includes the diameter of the collection spindle and the combined thickness of collected portions of the profiled retraction wire.

We claim: 
     
         1 . A stent deployment system, including a wire collection device comprising:
 a profiled retraction wire comprising a distal end coupled to a sledge and a proximal end coupled to a collection spindle, the sledge coupled to a proximal end of an outer sheath comprising a distal end surrounding a stent;   an actuator coupled to the collection spindle and operable to actuate rotation of the collection spindle to collect the profiled retraction wire around the collection spindle, wherein collection of the profiled retraction wire retracts the outer sheath across an outer surface of the stent so as to deploy the stent; and   a varying collection diameter that comprises a diameter of the collection spindle and a combined thickness of collected portions of the profiled retraction wire.   
     
     
         2 . The system of  claim 1 , wherein the actuator comprises a thumbwheel that is offset from the collection spindle and coupled to the collection spindle by a transmission mechanism comprising a belt, a rack and pinion, a clutch, a ratchet, or any combination thereof. 
     
     
         3 . The system of  claim 1 , wherein the actuator comprises a push button rod that forms a rack, the collection spindle forms a pinion. 
     
     
         4 . The system of  claim 1 , wherein the profiled retraction wire comprises a varying diameter that varies along a curvilinear profile. 
     
     
         5 . The system of  claim 1 , wherein the profiled retraction wire comprises a varying diameter that increases from the distal end towards the proximal end of the profiled retraction wire. 
     
     
         6 . The system of  claim 2 , wherein the varying diameter increases linearly from the proximal end towards the distal end of the profiled retraction wire. 
     
     
         7 . The system of  claim 1 , further comprising a diameter increasing construct that increases the collection diameter as the collection spindle rotates so as to increase a retraction speed of the outer sheath. 
     
     
         8 . The system of  claim 7 , wherein the diameter increasing construct comprises a cam that rotates about a central axis of the collection spindle, wherein:
 the cam comprises a first end at a minimum distance from an outer surface of the collection spindle and a second end at a maximum distance from the outer surface of the collection spindle;   the cam is rotatable to collect the profiled retraction wire across a surface of the cam extending from the first end to the second end of the cam, thereby increasing the collection diameter as the collection spindle rotates.   
     
     
         9 . The system of  claim 7 , wherein the diameter increasing construct comprises a plurality of beads located along the profiled retraction wire, the plurality of beads aligned to provide support for an inner catheter extending through the outer sheath. 
     
     
         10 . The system of  claim 9 , wherein the plurality of beads comprises grooves to support the inner catheter. 
     
     
         11 . The system of  claim 9 , wherein the plurality of beads increases in size along the profiled retraction wire to accommodate a changing resistance during sheath retraction. 
     
     
         12 . The system of  claim 9 , wherein the plurality of beads comprise rectangular, square, round, or ellipsoid shapes, or any combination thereof. 
     
     
         13 . A stent deployment system, including a wire collection device comprising:
 a profiled retraction wire coupled to an outer sheath to retract the outer sheath to deploy a stent from a distal end of the outer sheath, the profiled retraction wire comprising a thickness that increases from a proximal end attached to a collection spindle towards a distal end coupled to a proximal end of the outer sheath; and   a thumbwheel coupled to the collection spindle and operable to actuate rotation of the collection spindle to collect the profiled retraction wire around a collection diameter that comprises the diameter of the collection spindle and the thickness of the retraction wire, wherein the collection diameter increases as the profiled retraction wire is collected around the collection spindle.   
     
     
         14 . The system of  claim 13 , further comprising a cam that surrounds the collection spindle such that the cam increases and decreases the collection diameter as the collection spindle rotates to collect the profiled retraction wire around the cam. 
     
     
         15 . The system of  claim 13 , wherein the cam is an eccentric, egg-shaped, or ellipsoid cam. 
     
     
         16 . The system of  claim 13 , wherein the collection spindle comprises a first shoulder and a second shoulder that aligns overlapping layers of the profiled retraction wire. 
     
     
         17 . The system of  claim 13 , wherein the profiled retraction wire comprises linked chains. 
     
     
         18 . The system of  claim 13 , further comprising diameter increasing constructs located along the profiled retraction wire. 
     
     
         19 . The system of  claim 16 , wherein the diameter increasing constructs comprise a plurality of beads. 
     
     
         20 . The system of  claim 17 , wherein the plurality of beads increases in size along the profiled retraction wire.